FIELD: cryogenic technique. SUBSTANCE: method comprises steps of separating in two stages of fractionating unit with reception of bottoms liquid, a purified gaseous nitrogen under pressure and a cleaned nitrogen reflux; taking off a part of the liquid nitrogen reflux from the second stage of the fractionating unit; heating that part and feeding it as an additional reflux to the first stage of the fractionating unit; expanding the purified gaseous nitrogen from the first stage of the fractionating unit in a centrifugal expander; secondary heating of it; after-compressing in a compressor and delivering to a user. EFFECT: simplified technological operations. 2 cl, 1 dwg
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Authors
Dates
1995-02-20—Published
1992-10-12—Filed